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command-help-seedsplit
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MMGEN-SEEDSPLIT: Generate a seed share from the default or specified MMGen wallet
USAGE: mmgen-seedsplit [opts] [infile] [<Split ID String>:]<index>:<share count>
OPTIONS:
-h, --help Print this help message
--longhelp Print help message for long options (common options)
-d, --outdir d Output files to directory 'd' instead of working dir
-e, --echo-passphrase Echo passphrases and other user input to screen
-i, --in-fmt f Input from wallet format 'f' (see FMT CODES below)
-o, --out-fmt f Output to wallet format 'f' (see FMT CODES below)
-H, --hidden-incog-input-params f,o Read hidden incognito data from file
'f' at offset 'o' (comma-separated)
-J, --hidden-incog-output-params f,o Write hidden incognito data to file
'f' at offset 'o' (comma-separated). File 'f' will be
created if necessary and filled with random data.
-O, --old-incog-fmt Specify old-format incognito input
-l, --seed-len l Specify wallet seed length of 'l' bits. This option
is required only for brainwallet and incognito inputs
with non-standard (< 256-bit) seed lengths.
-L, --label l Specify a label 'l' for output wallet
-M, --master-share i Use a master share with index 'i' (min:1, max:1024)
-p, --hash-preset p Use the scrypt hash parameters defined by preset 'p'
for password hashing (default: '3')
-z, --show-hash-presets Show information on available hash presets
-P, --passwd-file f Get wallet passphrase from file 'f'
-N, --passwd-file-new-only Use passwd file only for new, not existing, wallet
-q, --quiet Produce quieter output; suppress some warnings
-r, --usr-randchars n Get 'n' characters of additional randomness from user
(min=10, max=80, default=30)
-S, --stdout Write wallet data to stdout instead of file
-v, --verbose Produce more verbose output
COMMAND NOTES:
This command generates shares one at a time. Shares may be output to any
MMGen wallet format, with one limitation: only one share in a given split may
be in hidden incognito format, and it must be the master share in the case of
a master-share split.
If the command's optional first argument is omitted, the default wallet is
used for the split.
The last argument is a seed split specifier consisting of an optional split
ID, a share index, and a share count, all separated by colons. The split ID
must be a valid UTF-8 string. If omitted, the ID 'default' is used. The
share index (the index of the share being generated) must be in the range
1-1024 and the share count (the total number of shares in the split)
in the range 2-1024.
Master Shares
Each seed has a total of 1024 master shares, which can be used as the first
shares in multiple splits if desired. To generate a master share, use the
--master-share (-M) option with an index in the range 1-1024 and omit
the last argument.
When creating and joining a split using a master share, ensure that the same
master share index is used in all split and join commands.
EXAMPLES:
Split a BIP39 seed phrase into two BIP39 shares. Rejoin the split:
$ echo 'zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong' > sample.bip39
$ mmgen-seedsplit -o bip39 sample.bip39 1:2
BIP39 mnemonic data written to file '03BAE887-default-1of2[D51CB683][128].bip39'
$ mmgen-seedsplit -o bip39 sample.bip39 2:2
BIP39 mnemonic data written to file '03BAE887-default-2of2[67BFD36E][128].bip39'
$ mmgen-seedjoin -o bip39 \
'03BAE887-default-2of2[67BFD36E][128].bip39' \
'03BAE887-default-1of2[D51CB683][128].bip39'
BIP39 mnemonic data written to file '03BAE887[128].bip39'
$ cat '03BAE887[128].bip39'
zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong
Create a 3-way default split of your default wallet, outputting all shares
to default wallet format. Rejoin the split:
$ mmgen-seedsplit 1:3 # Step A
$ mmgen-seedsplit 2:3 # Step B
$ mmgen-seedsplit 3:3 # Step C
$ mmgen-seedjoin <output_of_step_A> <output_of_step_B> <output_of_step_C>
Create a 2-way split of your default wallet with ID string 'alice',
outputting shares to MMGen native mnemonic format. Rejoin the split:
$ mmgen-seedsplit -o words alice:1:2 # Step D
$ mmgen-seedsplit -o words alice:2:2 # Step E
$ mmgen-seedjoin <output_of_step_D> <output_of_step_E>
Create a 2-way split of your default wallet with ID string 'bob' using
master share #7, outputting share #1 (the master share) to default wallet
format and share #2 to BIP39 format. Rejoin the split:
$ mmgen-seedsplit -M7 # Step X
$ mmgen-seedsplit -M7 -o bip39 bob:2:2 # Step Y
$ mmgen-seedjoin -M7 --id-str=bob <output_of_step_X> <output_of_step_Y>
Create a 2-way split of your default wallet with ID string 'alice' using
master share #7. Rejoin the split using master share #7 generated in the
previous example:
$ mmgen-seedsplit -M7 -o bip39 alice:2:2 # Step Z
$ mmgen-seedjoin -M7 --id-str=alice <output_of_step_X> <output_of_step_Z>
Create a 2-way default split of your default wallet with an incognito-format
master share hidden in file 'my.hincog' at offset 1325. Rejoin the split:
$ mmgen-seedsplit -M4 -o hincog -J my.hincog,1325 1:2 # Step M (share A)
$ mmgen-seedsplit -M4 -o bip39 2:2 # Step N (share B)
$ mmgen-seedjoin -M4 -H my.hincog,1325 <output_of_step_N>
PASSPHRASE NOTE:
For passphrases all combinations of whitespace are equal, and leading and
trailing space are ignored. This permits reading passphrase or brainwallet
data from a multi-line file with free spacing and indentation.
BRAINWALLET NOTE:
To thwart dictionary attacks, it’s recommended to use a strong hash preset
with brainwallets. For a brainwallet passphrase to generate the correct
seed, the same seed length and hash preset parameters must always be used.
FMT CODES:
Format FileExt Valid codes
------ ------- -----------
BIP39Mnemonic .bip39 bip39
Brainwallet .mmbrain mmbrain,brainwallet,brain,bw
DieRollWallet .b6d b6d,die,dieroll
IncogWallet .mmincog mmincog,incog,icg,i
IncogWalletHex .mmincox mmincox,incox,incog_hex,ix,xi
IncogWalletHidden None incog_hidden,hincog,ih,hi
MMGenHexSeedFile .mmhex seedhex,hexseed,mmhex
MMGenMnemonic .mmwords mmwords,words,mnemonic,mn,m
MMGenSeedFile .mmseed mmseed,seed,s
MMGenWallet .mmdat wallet,w
PlainHexSeedFile .hex hex,rawhex,plainhex
MMGEN v15.0.0 September 2024 MMGEN-SEEDSPLIT(1)
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